Grant, U.F. & Don Tanner (editor): Snip-Snip Want Ad Test © U.F. Grant Softcover, stapled manuscript, 8.5x11", 3 pages

Image courtesy eBay seller TJGonFishn

Comments: A want-ad column is snipped from the bottom until spectator calls stop; selected Ad was predicted; no switches

Contents (from book description):

1 Introduction
2 Effect
2 Routine & Presentation
3 Comedy Ad Ideas
3 Illustration: of sample want ads